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Climate 2016, 4(4), 49; doi:10.3390/cli4040049

Multiyear Rainfall and Temperature Trends in the Volta River Basin and their Potential Impact on Hydropower Generation in Ghana

1
Department of Energy and Environmental Engineering, University of Energy and Natural Resources, P. O. Box 214, Sunyani, Ghana
2
Department of Mechanical Engineering, University of Ibadan, Ibadan, Nigeria
3
School of Graduate Studies, University of Energy and Natural Resources, P. O. Box 214, Sunyani, Ghana
4
Department of Science, Technology, Engineering & Public Policy (STEaPP), University College London, London WC1E 6BT, UK
5
Office of the Pro-Vice Chancellor, University of Energy and Natural Resources, P. O. Box 214, Sunyani, Ghana
6
Earth Observation Research and Innovation Centre, University of Energy and Natural Resources, P. O. Box 214, Sunyani, Ghana
*
Author to whom correspondence should be addressed.
Academic Editors: Daniele Bocchiola, Claudio Cassardo and Guglielmina Diolaiuti
Received: 2 May 2016 / Revised: 8 September 2016 / Accepted: 19 September 2016 / Published: 12 October 2016
(This article belongs to the Special Issue Impact of Climate Change on Water Resources)
View Full-Text   |   Download PDF [5397 KB, uploaded 12 October 2016]   |  

Abstract

The effects of temperature and rainfall changes on hydropower generation in Ghana from 1960–2011 were examined to understand country-wide trends of climate variability. Moreover, the discharge and the water level trends for the Akosombo reservoir from 1965–2014 were examined using the Mann-Kendall test statistic to assess localised changes. The annual temperature trend was positive while rainfall showed both negative and positive trends in different parts of the country. However, these trends were not statistically significant in the study regions in 1960 to 2011. Rainfall was not evenly distributed throughout the years, with the highest rainfall recorded between 1960 and 1970 and the lowest rainfalls between 2000 and 2011. The Mann-Kendall test shows an upward trend for the discharge of the Akosombo reservoir and a downward trend for the water level. However, the discharge irregularities of the reservoir do not necessarily affect the energy generated from the Akosombo plant, but rather the regular low flow of water into the reservoir affected power generation. This is the major concern for the operations of the Akosombo hydropower plant for energy generation in Ghana. View Full-Text
Keywords: rainfall; temperature; discharge irregularities; water level; Sen’s slope; Mann-Kendall test rainfall; temperature; discharge irregularities; water level; Sen’s slope; Mann-Kendall test
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MDPI and ACS Style

Kabo-Bah, A.T.; Diji, C.J.; Nokoe, K.; Mulugetta, Y.; Obeng-Ofori, D.; Akpoti, K. Multiyear Rainfall and Temperature Trends in the Volta River Basin and their Potential Impact on Hydropower Generation in Ghana. Climate 2016, 4, 49.

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